Apparatus and methods related to mats and connects are described. The apparatus include a mat having a top side, a bottom side, and an interior defined between the top side and the bottom side, and at least one connector post extending within the interior of the mat, wherein the at least one connector post comprises a connector pin cavity extending within the interior of the mat and configured to receive a connector pin and at least one locking structure configured to engage with a portion of the connector pin and secure the connector pin to the at least one connector post.